Defensive publication

ABSTRACT

THIS INVENTION RELATES TO SUPERSENSITING DYE COMBINATIONS USEFUL FOR ORGANIC PHOTOCONDUCTIVE COMPOSITIONS COMPRISING: AT LEAST ONE CYANINE, MEROCYANINE, RHODACYANINE OR STYRYL SPECTRAL SENSITIZING DYE WHICH (1) HAS AN ANODIC POLAROGRAPHIC HALF-WAVE POTENTIAL LESS THAN +1.0 VOLT, (2) HAS AN ANODIC POLAROGRAPPHIC HALF-WAVE POTENTIAL AND A CATHODIC POLAROGRAPHIC HALF-WAVE POTENTIAL WHICH, WHEN ADDED TOGETHER, GIVE A SUM MORE NEGATIVE THAN -0.10 VOLT, AND (3) DESENSITIZES NEGATIVE SILVER BROMIDE EMULSIONS, CONTAINING 99.35 MOLE PERCENT BROMIDE, LESS THAN 0.4 LOG E AT A RADIATION OF 365 NM. WHEREIN INCORPORATED THEREIN AT A CONCENTRATION OF0.2 MILLIMOLE OF DYE PER MOLE OF SILVER HALIDE, AND AT LEAST ONE ELECTRON-ACCEPTING DYE SUCH AS A PYRYLIUM OR THIAPYRYLIUM SALT AS THE SUPERSENSITIZER.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969. 889 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification. including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public-tor inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have notEbeen examined as to the merits of alleged invention. The Patent Olflce makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED APRIL 3, 1973 T909,009 SUPERSENSITIZING DYE COMBINATION FOR ELECTROPHOTOGRAPHIC COMPOSITION AND ELEMENT Jean Elmore Jones and William Edward Yoerger, both Eastman Kodak Co., 1669 Lake Ave., Rochester, NY. 14650 Filed June 12, 1972, Ser. No. 261,881 Int. Cl. G03g 5/06 US. Cl. 961.6 No Drawing. 25 Pages Specification This invention relates to supersensitizing dye combinations useful for organic photoconductive compositions comprising: at least one cyanine, merocyanine, rhodacyanine or styryl spectral sensitizing dye which (1) has an anodic polarographic half-wave potential less than +1.0 volt;

(2) has an anodic polarographic half-wave potential and a cathodic polarographic half-wave potential which, when added together, give a sum more negative than -0.10 volt; and

(3) desensitizes negative silver bromide emulsions, containing 99.35 mole percent bromide, less than 0.4 log E at a radiation of 365 nm. wherein incorporated therein at a concentration of 0.2 millimole of dye per mole of silver halide; and at least one electron-accepting dye such as a pyrylium or thiapyrylium salt as the supersensitizer. 

